On Thursday, 11 February 2016 03:24:33 UTC+1, Stephen Sprunk  wrote:   
   > On 09-Feb-16 10:49, Jishnu Mukerji wrote:   
      
   > > Amtrak is neither changing the voltage nor the frequency on NEC   
   > > south. They are adding 25Hz capacity. They don't foresee any problem   
   > > with operating at 160mph using 12.5kV 25Hz.   
   >   
   > 12.5kV means four times as much current as 2x25kV, but if they think   
   > their decrepit infrastructure can handle the load, c'est la vie.   
      
   As I pointed out elsewhere in the thread, DB (German railways) operate   
   significantly higher power trains (200 mph ICE3 units) under 15 kV 16.7 Hz   
   catenery.   
      
   > Variable-tension and 25Hz are far more pressing problems that can be   
   > corrected independently, though it'd be wise to do both in a way that   
   > makes moving to 2x25kV later much easier.   
      
   The constant tension catenery is the biggest impediment to improved   
   performance on the NEC.   
      
   Robin   
      
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